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Materials 2014, 7(5), 3337-3352; doi:10.3390/ma7053337
Article

Flowable Backfill Materials from Bottom Ash for Underground Pipeline

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Received: 14 February 2014; in revised form: 9 April 2014 / Accepted: 23 April 2014 / Published: 25 April 2014
(This article belongs to the Special Issue Recycled Materials)
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Abstract: The purpose of this study was to investigate the relationship between strength and strain in manufacturing controlled low strength materials to recycle incineration bottom ash. Laboratory tests for controlled low strength materials with bottom ash and recycled in-situ soil have been carried out. The optimum mixing ratios were 25%–45% of in-situ soil, 30% of bottom ash, 10%–20% of fly ash, 0%–3% of crumb rubber, 3% of cement, and 22% of water. Each mixture satisfied the standard specifications: a minimum 20 cm of flowability and 127 kPa of unconfined compressive strength. The average secant modulus (E50) was (0.07–0.08) qu. The ranges of the internal friction angle and cohesion for mixtures were 36.5°–46.6° and 49.1–180 kPa, respectively. The pH of all of the mixtures was over 12, which is strongly alkaline. Small-scale chamber tests for controlled low strength materials with bottom ash and recycled in-situ soil have been carried out. Vertical deflection of 0.88–2.41 mm and horizontal deflection of 0.83–3.72 mm were measured during backfilling. The vertical and horizontal deflections of controlled low strength materials were smaller than that of sand backfill.
Keywords: backfill materials; bottom ash; small-scaled chamber test; controlled low strength materials backfill materials; bottom ash; small-scaled chamber test; controlled low strength materials
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Lee, K.-J.; Kim, S.-K.; Lee, K.-H. Flowable Backfill Materials from Bottom Ash for Underground Pipeline. Materials 2014, 7, 3337-3352.

AMA Style

Lee K-J, Kim S-K, Lee K-H. Flowable Backfill Materials from Bottom Ash for Underground Pipeline. Materials. 2014; 7(5):3337-3352.

Chicago/Turabian Style

Lee, Kyung-Joong; Kim, Seong-Kyum; Lee, Kwan-Ho. 2014. "Flowable Backfill Materials from Bottom Ash for Underground Pipeline." Materials 7, no. 5: 3337-3352.


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